Hi folks

Probably a naïve question, but although I try to work with mmCIF files, 
occasionally I need to convert coordinates to the legacy PDB format for legacy 
programs that simply don’t understand mmCIF and never will.

One thing that I need to do is to write the PDB ID into the HEADER line in the 
PDB file; conventionally, I’d write this into columns 63-66 (as per the 
documentation), and this is fine while I have an entry like “pdb_00007al9”; 
however, what should I do if I have an entry like “pdb_00237al9”?

I can see that this will probably never have a single correct answer since we 
should all be using mmCIF anyway, but I wondered what other people might do? 

I’d be inclined to extend the ID into columns 60 - 63, which would future proof 
_me_ until I retire properly, but might not work for the young folk who will be 
working long after that!

Thoughts?

Harry

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